在DES加密算法c＃中生成64位密钥

Question

我搜索了这个问题并找到了解决方案，但我发现钥匙有时会产生于64,63,62或61我不知道为什么任何人都可以帮助我 并感谢您的帮助

RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
byte[] buff = new byte[8];

rng.GetBytes(buff);

StringBuilder hexString = new StringBuilder(64);

for (int counter = 0; counter < buff.Length; counter++)
{
    hexString.Append(String.Format("{0:X2}", buff[counter]));
}

string Key = hex2binary(hexString.ToString());